Food Engineering / Gıda Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/12

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Author: search.filters.author.Özer, Merve

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  • Article
    Citation - WoS: 9
    Citation - Scopus: 11
    Development of a Functional Chocolate Using Gamma-Amino Butyric Acid Producer Lacticaseibacillus Rhamnosus Nrrl B-442
    (Elsevier, 2022) Özer, Merve; Öztürk, Burcu; Hayaloğlu, Ali Adnan; Tellioğlu Harsa, Şebnem
    The human microbiota is influenced by the immune and nervous systems of the host. Gamma-aminobutyric acid (GABA) is known as bioactive compound and it has important physiological functions, such as anti-hypertensive and antidepressant activities. Lactic acid bacteria (LAB), especially Lactobacillus species are known as the most important GABA producers because of the food-grade nature. The purpose of this study is to develop a functional chocolate using microencapsulated GABA producer Lacticaseibacillus rhamnosus NRRL B-442 strain for patients having an anxiety disorder. Water-in-oil emulsion technique was conducted for microencapsulation using whey-pullulan complex. Microencapsulated and free L. rhamnosus cell counts were 6.75 and 7.20 log CFU/g in chocolates, respectively, at the end of 60 days. During simulated in vitro digestion analysis, survival rate of microencapsulated bacteria in chocolate samples was found at higher percentage (87%) than free bacteria (75%). Furthermore, microencapsulated L. rhamnosus did not affect the physical, chemical, and sensory properties of chocolate. Consequently, L. rhamnosus with the highest GABA producing capability may provide insight for an anxiety disorder patient, since this strain has been thought as having a therapeutic effect. A new functional food model was developed for “GutBrain Axis” phenomena since the chocolate could be accepted as a good carrier for GABA producer bacteria.
  • Article
    Citation - WoS: 15
    Citation - Scopus: 17
    Effect of Different Microencapsulating Materials on the Viability of S. Thermophilus Ccm4757 Incorporated Into Dark and Milk Chocolates
    (Elsevier Ltd., 2021) Öztürk, Burcu; Elvan, Menşure; Özer, Merve; Tellioğlu Harsa, Şebnem
    This study aimed to evaluate the viability and bioaccessibility of Streptococcus thermophilus CCM4757 strain supplemented in dark and milk chocolates during storage period and pass through simulated in vitro gastro-intestinal tract. Microencapsulated and non-microencapsulated S. thermophilus CCM4757 strain added into the chocolates. Emulsion technique was used to microencapsulate cells with various biopolymers; carboxymethylcellulose, pectin, gum arabic, and cellobiose. The microencapsulated S. thermophilus with these coating materials was found to be viable higher than 9 log CFU/g up to 180 days of storage at 4 °C. Microbiological, physicochemical, and sensorial attributes of the chocolates containing microencapsulated and non-microencapsulated S. thermophilus CCM4757 were analyzed. The microencapsulated S. thermophilus showed a good survivability in milk (7.12 log CFU/g) and dark (6.90 log CFU/g) chocolate samples during 180-day storage at 4 °C. Supplementation of S. thermophilus did not affect significantly (P > 0.05) the sensory attributes of the chocolates. The results showed that S. thermophilus CCM4757 exhibited good cell survivability higher than 85% in chocolates under simulated gastro-intestinal fluids. S. thermophilus supplementation into the chocolate protected the viability of cells and did not affect the sensorial characteristics and moisture content of chocolates. The present study demonstrated that the dark and milk chocolates could be used as an important matrix to carry probiotics. © 2021 Elsevier Ltd
  • Article
    Probiyotik ve Prebiyotiklerin Bağırsak-beyin Aksına Etkisi
    (Sidas Medya Ajans Tanıtım Danışmanlık Ltd. Şti., 2019) Özer, Merve; Özyurt, Gonca; Tellioğlu Harsa, Şebnem
    Tüm dünyada değişen beslenme dinamikleri ile insanlar, sağlıklı yaşamı destekleyecek fonksiyonel besinler tüketmeye yönelmektedir. Günümüz yaşam koşullarında yaşanan stres düzeyi ve duygu değişimleri gibi psikolojik belirtilerin bağırsak mikrobiyotasını olumsuz yönde etkilemektedir. Bireylerde görülen nöropsikiyatrik bozukluklar, gama-amino bütirik asit vb. nörotransmitterlerin salınımındaki değişimlerde rol oynarken, fonksiyonel gıda bileşenleri terapötik ürün olarak bu nöropsikiyatrik bozuklar üzerinde etkili olabilmektedir. Derlemenin amacı, prebiyotik ve probiyotiklerin ve bunları içeren fonksiyonel gıdaların mikrobiyota sağlığı, dolayısıyla bağırsak-beyin aksı üzerindeki olumlu katkılarının incelenmesidir. Probiyotik ve prebiyotik tanımı, sentezledikleri nörotransmiterler, nöropsikolojik sağlık üzerindeki etkileri, bağırsaklardaki metabolik bozuklukların nöropsikiyatrik rahatsızlıkların meydana gelmesindeki rolü, bağırsak-beyin ekseninin bu mekanizmadaki önemi bilimsel araştırmalar ve güncel literatür ışığında sunulmaktadır, bu disiplinlerarası alanda gıda biyobilimlerinin katkısının ve öneminin altı çizilmektedir.